Variable volume pump



Jan. 1952 H. B. ADAMS ETAL 2,581,160

VARIABLE VOLUME PUMP Filed Dec. 15, 1947 4 Sheets-Sheet l Jan. 1, 1952 Filed Dec. 15, 1947 H. B.-ADAMS ETAL VARIABLE VOLUME PUMP 4 Sheets-Sheet 2 I N V EN TORS, 547/0/0 B. fla /71.)",

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Jan. 1, 1952 H. B. ADAMS ET AL 2,581,160

VARIABLE VOLUME PUMP Filed Dec. 15, 1947 BY Zia/170a 6. Friars.

4 Sheets-Sheet 5 Filed Dec. 15, 1947 i 1952 H. B. ADAMS ETAL 2,581,160

- VARIABLE VOLUME VPI-IMP i/ Z/wey.

4 Sheets-Sfiaet 4 Patented Jan. 1, 1952 VARIABLE VOLUME PUllIP Harold B. Adams, Mission, Kans, and Maurice c. Peters, Salt Lake City, Utah Application December 15, 1947, Serial No. 791,876

4 Claims. 1 This invention relates to improvements in variable volume pumps, and has particular refer- .ence to a variable volume pump of the rotary type having vanes mounted for axial adjustment. The principal object of the present invention is the provision of a variable volume rotary pump having axially. adjustable rotary vanes whereby the volume of the pump is varied.

Another object of this invention is the provision of a rotary pump provided with axially slidable rotatable vanes having resilient means to urge them in one direction and cams to urge the vanes in the opposite direction against the action of said resilient means.

A furtherobject of the invention is the provision of a rotary pump having a rotor mounted in a cylinder having an axially adjustable side wall whereby the cylinder volume may be varied.

Other objects are simplicity and economy of construction, ease and efficiency of operation, and means for maintaining proper pressures about the various working parts of the pump.

With these objects in view, as well as other objects which will appear during the'course of the specification, reference will be had to the drawings wherein:

Figure l is a front view of a variable volume rotary pump embodyingthis invention.

Fig. 2 is a rear elevational view of the pump shown in Fig. 1.

Fig. 3 is an enlarged sectional view taken on line IIIIII of Fig. 1.

Fig. 4 is a reduced sectional view taken on line IV1V of Fig. 3.

Fig. 5 is a detached reduced central sectional view of the housing positioned as shownin Fig. 3.

Fig. 6 is a reduced sectional view taken on line VI-VI of Fig. 3.

Fig. 7 is a reduced sectional view taken on line VlI-VII of Fig. 3 with thecam member left in elevation.

Fig. 8 is a sectional view ,taken on line VIII V'III of Fig. 3.

Fig. 9 is a front face view of the rotor.

Fig. 10 is an edge view of the rotor.

Fig. 11 is a rear face view of the movable side wall section of the pump.

Fig. 12 is an edge view of the side wall section shown in Fig. 11.

Fig. 13 is an elevational view of one of the pump vanes.

Fig. 14 is an edge view Fig. 13. v

Fig. 15 is an inner face view of the manually operable adjusting cam member.

of the vane shown in Fig. 16 is a side elevational view of the cam member shown in Fig. 15.

Fig. 17 is an inner elevational view of the cover member. 7

Fig. 18 is an edge view of the cover member.

Throughout the several views like reference characters refer to similar parts and the numeral 20 designates a cylindrical pump housing having a front end member 22 offset concentrically at 24 and 28 to receive certain parts as hereinafter set forth. The rear end of the housing is open and provided with a cover 28 secured adjacent its outer edge by means of a series of screws 30. Cover 28 is circular in form and is provided with an inturned concentric annular flange 32 which is recessed at its periphery at 34 to present a continuous cam face 36. The rear portion of the inner wall of housing 20 is circumferentially recessed at 38 to form a cam face 40. It will be noted that cam faces 33 and 40 are disposed concentrical with their corresponding radial portions in perpendicular alignmentwith the axis of the cylinder 20.

A shaft 42 is centrally mounted in housing 28 with its one end portion mounted in a bearing 44 formed in cover 28, and its other end is rotatably mounted in a recess bearing 46 formed in the body of a shifting cam block 48 which is rotatably fitted into the offset portions 24 and 28 of housing 20. The cam block 48 is provided with a forwardly extending stem 50 disposed in axial alignment with shaft 42 and is extended through a bearing 52 in the'front end wall 22 of housing 20. Shaft bearing 44 and stem bearing 52 are respectively provided with stuiling boxes 54 and 56.

Rigidly mounted on, shaft 42 by pins 58 is a rotor 60 of a general cylindrical form and adapted to operatively engage the inner peripheral wall of housing 20. This rotor 60 is radially slotted to present operating slideways 62 for transversely operable vanes 64. The rear side of the rotor is provided with a removable annular ring cover plate 66 secured thereto by screws 68, which serves as a bearing plate for the springs 10 which serve to urge the vanes forwardly at all times.

The rearward face of rotor 50 is recessed to form an annular groove 12 to receive the inturned flange 32 of cover 28, while the forward face is provided with an integral annular ring '14 posi- 3 snugly lit in slideways 62, and are provided at their opposite rearward corners with transversely disposed lugs I6 adapted to engage and ride respectively on cam face 36 and cam face 40 whereby as the rotor is moved about its axis the vanes will be moved transversely of the direction of rotation against the action of springs 10 which serve to=constantly urge the lugs I6 against said cams or :againstan adjustable chamber wall as hereinafter set forth.

Each, vane is provided with a pair of spaced apart recesses 80 extending inwardly from its rear vedge. Each recess is adapted to receive one end portion of spring 1.0 while the other .end thereof is positioned on cover platelifi by a pilot pin I8 fixed in the cover plate. The operating chamber 82 is provided with a radially disposed partition 84 securely positioned in housing 20 by means of screws 86. An inlet port 88 is formed at one-side of said partition while an outletport .1!] is formed at the "opposite side thereof. Re-

.ferring to Fig. 1 it will 'b'enoted that partition inner side wall of the rotor 68 to normally hold it in operative relation relative to the housing 26. axially adjustable Zsid'e wall member 92 of general cylindrical form slidably 'fitted into the fforw'ard endlportionfof housing '29 is radially slit .at fl to snugly fit aboutjpartition 84 to prevent rotation of said wall 'memberrelative to said housing.

I The rear wall of wall mem'berSZ is planar in form and disposed at a right angle to the axis .o'f-rotor 6E to lform one side wall of the annular working chamber. "The forward "portion of side -wall.memoerf92 'is provided with an axially dis- ,posed series of o'amte'eth '98 which are adapted to mesh-with a series of cam'teeth 98 formed on the inner face or manually operable cam block 48. The cam block stem 50 extends outwardly .from housing 128 andlis fprovided with a fixed crank arm 'lflll'by means of which the :cam'teeth 98 .may be .moved relative to cam teeth 95 to force the wall member f92 rearwardly against the urge of springs Ill to narrow 'the operating chamber to reduce the axial movement of the vanes'6'4.

The inner face wall member 52 is annularly {grooved at I02 to receive the .annular ring "14 whereby the .rotor 66 and wall member 922 are slidably joined together. The wall member 92 .is further recessed at HM to receive the end portionof a spring .Ill'fi disposed under compression against the 'forward wall of rotor 60.

The depth of recess IE2 is su'fiicient'to permit the movement of wall .member '92 until its rear wall rests against the forward wall of rotor 58, thus totally eliminating the operating chamber or limiting .it to any .desired .degree to regulate the pump capacity.

\Vith the relativexaxial movement of the pump ,parts 'it is quite evident that the movement of compressed liquids between the .parts must be provided .for. transverse holes I08 which communicate with recess I Hi thence through holes H2 formed through the wall member 92 .and into a chamber 1T4 formed between the wall member 92 and cam block 58. Openings II'3 formed through the flange 32 interconnects recess 34 with annulaingrooves I2. .An opening H5 in .wall member 92 connects chamber 'I M with annular-groove A02.

The pressureof the liquid filling the voids between the moving parts is substantially the The rotor 66 is provided with f the springs '10.

same as the pressure of the liquid being discharged from the pump. To obtain this pressure, tubes H5 and H8 communicate respectively with ports 33 and 98 and are connected with opposite sides of a three-way valve I20 which has a lead tube I22 communicating with annular groove 38 which interconnects with groove I2. By means of this tubular-connection liquid may 'be fed fromeither port 88 or 90 by simple adjustment of three-way valve I20.

It will be noted that this rotary pump is so symmetrically constructed that it may be driven in either direction to drive the liquid in either direction-therethrough.

The actions of the vanes are controlled by the rotation of the rotor 50, the earns 36 and 40, and Each vane passes through the same sequence of movements with each full revolution of the rotor. Referring to Fig. 3 it will be noted that the upper lugs 16 are spaced apart 'from earns "36 and t'll so that the springs "ID will exert their entire force to'urge thevane 60 tightly against'the walhnember'92; however, as the rotor moves 'on its "axis"to .move the lugs in contact with the "transversely inclined portions I24 of "said -cams then'theyane "will be moved axially the vanes are in 'theirtop position asshown in Fig. however they ;will always take the same lower position to clear. radial partition 84.

An adapter 126 secured .by screws I28 to housing 2%? 'is symmetrical in form an'd'has two ,passageways 1'30 "and :132 to connect respectively with a suitable source ofliquid'to be pumped and a'container for the pumped liquid (not shown) What we .claim as new and desire to protect by "Letters Patent is: j

V l. A rotary pump "comprising a cylindrical housing; an axially "fixed rotor, having radial slots formed inwardly from its'outer periphery, rotatably mounted in one .endof said housing; an axially adjustable head'wall membernormally spaced "from said rotor to form an operating chamber therebetween; vanes slidably mounted in the slots in said rotor; resilient .means normally urging said "vanes axially against .said head wall member to close said operating chamber; and cams carried in fixedre'lation withsaid housing adaptedtoen'gage and'forne said .vanes against the urge of said resilient means away from said head wall member as saidrotor is moved on'its axis. e

2. A rotary ,pump comprising a cylindrical housing; an axially fixed rotor, having radial slots formed inwardly .fromits outer periphery, rotatably mounted in one end of said housing; a radially disposed vpartition member secured to said housing to abut against theforward wall of said rotorto preclude axial movement thereof; an axially adjustable head wall member normally spaced from said rotor to ,form an operating chamber therebetween having an inlet .port and an outletport; vanes slidably mounted mally urging said vanes axially against saidh'ead wall member to close said operating chamber; cams carried in fixed relation with said housing adapted to engage and force said vanes against the urge of said resilient means away from said head wall member as said rotor is moved on its axis.

3. A rotary pump comprising a cylindrical housing having peripherally spaced apart inlet and outlet ports; an axially fixed rotor, having radial slots formed inwardly from its outer periphery, rotatably mounted in one end of said housing; a radially disposed partition member secured to said housing intermediate said inlet and outlet ports to abut against the forward wall of said rotor to preclude axial movement thereof; an axially adjustable head wall member normally spaced from said rotor to form an operatin chamber therebetween having an inlet port and an outlet port; vanes slidably mounted in the slots in said rotor; resilient means normally urging said vanes axially against said head wall member to close said operating chamber; cams carried in fixed relation with said housing adapted to engage and force said vanes against the urge of said resilient means away from said head Wall member as said rotor is moved on its axis.

4. A rotary pump comprising a cylindrical housing; an axially fixed drive shaft concentrically mounted for rotation in said housing; a rotor, having radial slots formed inwardly from lindrical wall of said its outer periphery, rotatably mounted in said housing to operatively fit against the inner cyhousing; an axially adjustable head wall member snugly fitted in said housing in spaced apart relation to said rotor to form a working chamber therebetween; means operable to adjust said head wall member toward and from said rotor whereby the volume of said working chamber is varied; a radial partition dividing said working chamber adjacent its lower portion and having a port adjacent each of its opposite sides connecting with said working chamber; vanes adjustably mounted for transverse movement in said rotor slots to move into and out of said working chamber to force liquid through said pump as said rotor is rotated in said housing.

HAROLD B. ADAMS.

MAURICE C. PETERS.

REFERENCES CITED The following references are of record in the file of this patent: 

